Header and exhaust question
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Intermediate
Joined: Mar 2016
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Header and exhaust question
Hi, my question is can i replace the whole set up from (after market) header, x-pipe, and axel back from a 08' Grand Sport to my 08' Z06? Do i lost power when downside from 3" pipes to 2.5" pipes? If i do, is it a significant lose or only couple of ponies? The reason i want to do it becuase it is hard to find after market stuffs for Z06 compare to Base or Grand Sport. Thank you for any helps.
Race Director
Joined: Sep 2007
Posts: 16,557
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Hi, my question is can i replace the whole set up from (after market) header, x-pipe, and axel back from a 08' Grand Sport to my 08' Z06? Do i lost power when downside from 3" pipes to 2.5" pipes? If i do, is it a significant lose or only couple of ponies? The reason i want to do it becuase it is hard to find after market stuffs for Z06 compare to Base or Grand Sport. Thank you for any helps.
Race Director
Joined: Dec 2013
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Understand exhaust scavenging to begin with.
So understanding this, you will realize why you make more power with LT headers, or even the Z06 shorty headers than the stock exhaust manifolds.
So LT headers in a 1 3/4" ID diameter will pick up around 25 to 30HP, while the Z06 shorty headers will pick up around 15hp instead.
Note, the 1 7/8" ID headers make less power than the 1 3/4" ID headers on your LS2 or LS# motor, since the smaller piping scavenges better/produces higher speeds through the collector for the exhaust you are pushing through them.
Now once you get past the header collector, then is becomes a mater of exhaust restriction instead. With a LS2 or 3 stock motor, there will so little of a difference between a 2.5 and 3" X pipe and down line, it really does not mater.
As for high flow cats in line, YES you want them about 3" after the collectors, since it will burn the un-burnt fuel, so your not stinking up the car like a drag car at the stop light. As for HP loss, about 3hp only with the high flow cats installed.
So understanding this, you will realize why you make more power with LT headers, or even the Z06 shorty headers than the stock exhaust manifolds.
So LT headers in a 1 3/4" ID diameter will pick up around 25 to 30HP, while the Z06 shorty headers will pick up around 15hp instead.
Note, the 1 7/8" ID headers make less power than the 1 3/4" ID headers on your LS2 or LS# motor, since the smaller piping scavenges better/produces higher speeds through the collector for the exhaust you are pushing through them.
Now once you get past the header collector, then is becomes a mater of exhaust restriction instead. With a LS2 or 3 stock motor, there will so little of a difference between a 2.5 and 3" X pipe and down line, it really does not mater.
As for high flow cats in line, YES you want them about 3" after the collectors, since it will burn the un-burnt fuel, so your not stinking up the car like a drag car at the stop light. As for HP loss, about 3hp only with the high flow cats installed.
